package cn.supermarket.framework.interceptor;

import cn.supermarket.common.annotation.RepeatSubmit;
import cn.supermarket.common.core.entity.Result;
import cn.supermarket.common.utils.ServletUtils;
import com.alibaba.fastjson2.JSON;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

/**
 * 防止重复提交拦截器
 * @Author yp
 * @Date 2024/5/28:11:07
 */
@Component
public abstract class RepeatSubmitInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception{
        if (handler instanceof HandlerMethod){
            HandlerMethod handlerMethod=(HandlerMethod)handler;
            Method method=handlerMethod.getMethod();
            RepeatSubmit annotation = method.getAnnotation(RepeatSubmit.class);
            if (annotation != null){
                if(this.isRepeatSubmit(request,annotation)){
                    Result result= Result.error(annotation.message());
                    ServletUtils.renderString(response, JSON.toJSONString(result));
                    return false;
                }
            }
            return true;
        }
        else
        {
            return true;
        }
    }

    /**
     * 验证是否重复提交由子类实现具体的防重复提交的规则
     *
     * @param request 请求信息
     * @param annotation 防重复注解参数
     * @return 结果
     * @throws Exception
     */
    public abstract boolean isRepeatSubmit(HttpServletRequest request, RepeatSubmit annotation);
}
